Traditionally, the anti-dilution provision is used to protect investors in the event a company issues equity at a lower valuation then in previous financing rounds. There are two varieties: weighted average anti-dilution and ratchet based anti-dilution.
Full ratchet means that if the company issues shares at a price lower than the Series A, then the Series A price is effectively reduced to the price of the new issuance. One can get creative and do “partial ratchets” (such as “half ratchets” or “two-thirds ratchets”) which are a less harsh, but rarely seen.
While full ratchets came into vogue in the 2001 – 2003 time frame when down-rounds were all the rage, the most common anti-dilution provision is based on the weighted average concept, which takes into account the magnitude of the lower-priced issuance, not just the actual valuation. In a “full ratchet world” if the company sold one share of its stock to someone for a price lower than the Series A, all of the Series A stock would be repriced to the issuance price. In a “weighted average world,” the number of shares issued at the reduced price are considered in the repricing of the Series A. Mathematically (and this is where the lawyers get to show off their math skills – although you’ll notice there are no exponents or summation signs anywhere) it works like this (note that despite the fact one is buying preferred stock, the calculations are always done in as-if-converted to common stock basis).
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